EP3134903A1 - Aluminiumpaste für dickfilmhybride - Google Patents
Aluminiumpaste für dickfilmhybrideInfo
- Publication number
- EP3134903A1 EP3134903A1 EP15720938.8A EP15720938A EP3134903A1 EP 3134903 A1 EP3134903 A1 EP 3134903A1 EP 15720938 A EP15720938 A EP 15720938A EP 3134903 A1 EP3134903 A1 EP 3134903A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metallization
- paste according
- aluminum
- ceramic substrate
- glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
Definitions
- the invention relates to aluminum-containing metallization pastes for the production of hybrid circuits.
- Aluminum metallizations are difficult to handle due to the very low redox potential of the aluminum and thus its easy oxidation and therefore not common.
- polymers with aluminum as
- Silver pastes with low aluminum doping for example 1 to 3% by weight of aluminum, are used in solar cell technology for the simultaneous doping and contacting of wafers.
- the aluminum content of the pastes used here is used for doping a wafer without back surface field and makes it possible to electrically contact the Si wafer with the silver electrode with a low contact resistance, see e.g. WO 2002/061854 A1.
- the doping of the back side serves as a substrate
- the doping with aluminum counteracts the decrease in the efficiency of a solar cell at low wafer thickness.
- the electrical contact is achieved by a silver content in the aluminum paste or by an additional silver-containing coating, see e.g. EP 2 418 656 A1.
- Antimony oxide is added to reduce the bending of the wafer when baking the two-dimensionally applied paste.
- the object of the invention is to provide a contacting or metallizing paste for use in thick-film hybrid technology that is less expensive than conventional silver-containing metallizing paste.
- This metallization paste for hybrid circuits on ceramic substrates is characterized by the fact that it comprises finely divided aluminum, a primer and a temporary organic vehicle for pasting.
- Antimony oxide as known from the prior art, is not necessary according to the invention, ie the metallizing paste contains no antimony oxide.
- a finely divided aluminum-containing paste with a glass portion and a temporary organic vehicle for pasting and simultaneously protecting the aluminum from oxidation can be prepared by various methods such as screen printing,
- Stencil printing, pad printing, spraycoating and other coating methods can be applied to surfaces of ceramic substrates such as Al2O3, AIN, ZrO2.
- the paste is dried and then sintered in the presence of oxygen at elevated temperature, preferably at temperatures between 600 and 1000 ° C, firmly on the support, so the ceramic substrate.
- the aluminum particles are preferably in finely divided, spherical form. They can be obtained by spraying liquid aluminum in an inert atmosphere.
- the spherical shape produces a minimum surface area to volume ratio, thereby minimizing the oxidation susceptibility of the aluminum.
- the particle size of the finely divided aluminum should be between 0.5 and 50 ⁇ (size determination by the laser scattering method according to ISO 13320: 2009) and is preferably 1 to 10 ⁇ , so that the particles by common
- Screen mesh such as VA160-18 with 45 ⁇ mesh size fit.
- a glass for example ZnO-SiO 2 -B 2 O 3
- Glasses that are suitable for adhesion promotion must be adapted to the material of the ceramic substrate in terms of their chemical nature and with respect to the thermal expansion coefficient.
- a ZnO-SiO 2 B 2 O 3 glass is preferably used which has a high affinity to both the surface of the ceramic substrates as well as to Al 2 O 3, which is formed on the surface of aluminum spheres during baking.
- moderators for adjusting the melting point, glass viscosity and thermal expansion coefficient in amounts of 0 to 10 wt .-% based on the mass of the glass may be included. Examples are CaO, ⁇ 2, ZrO2, B12O3 and / or Li 2 O.
- the moderators can be melted into the glass or added as a binary oxide to the base glass.
- the solid paste material apart from the organic paste vehicle, is then filled with aluminum powder to 100 wt .-%. This results in thus 75 to 99 wt .-% aluminum powder as solid constituents of the metallizing paste.
- organic paste vehicles known media such as ethyl cellulose or acrylic resin dissolved in high-boiling solvents such as pine oil, terpineol,
- Butylcarbitol, Texanal (also in combination) can be used.
- the applied paste dried in air at about 60 to 110 ° C may be baked in air, for example, in a belt furnace or in a chamber furnace in a total process of 30 to 150 minutes with a temperature peak of 600 to 1000 ° C for 1 to 15 minutes.
- the metallization is electrically conductive and has an adhesive strength of over
- Metallization surface measured.
- the specific adhesive strength is in the usual range of, for example, silver metallizations.
- the thermal conductivity is over 100 W / mK.
- Metallization is a low-cost alternative to
- Total addition amount of the glass was 5% by weight.
- 1% by weight of tetradecanol was added as moderator and the mixture was pasted with terpineol with 1% by weight of ethylcellulose.
- the paste was screen printed on a 96% alumina substrate using a 120 mesh stainless steel screen.
- the printed ceramic was then at 80 ° C for 30 min.
- the bond strength in the nut test was 30 N / mm2, the electrical conductivity of the applied hybrid at 4.2 ohms.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Conductive Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014207840 | 2014-04-25 | ||
| PCT/EP2015/059087 WO2015162298A1 (de) | 2014-04-25 | 2015-04-27 | Aluminiumpaste für dickfilmhybride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3134903A1 true EP3134903A1 (de) | 2017-03-01 |
| EP3134903B1 EP3134903B1 (de) | 2019-06-12 |
Family
ID=53055018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15720938.8A Active EP3134903B1 (de) | 2014-04-25 | 2015-04-27 | Aluminiumpaste für dickfilmhybride |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3134903B1 (de) |
| DE (1) | DE102015207697A1 (de) |
| WO (1) | WO2015162298A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19945866A1 (de) * | 1999-09-24 | 2001-03-29 | Dmc2 Degussa Metals Catalysts | Verfahren zur Herstellung einer leitfähigen Beschichtung auf Glas oder emailliertem Stahl und hiernach beschichtete Substrate |
| DE10104726A1 (de) | 2001-02-02 | 2002-08-08 | Siemens Solar Gmbh | Verfahren zur Strukturierung einer auf einem Trägermaterial aufgebrachten Oxidschicht |
| KR20110015051A (ko) * | 2008-06-26 | 2011-02-14 | 이 아이 듀폰 디 네모아 앤드 캄파니 | 광전지용 전도체에 사용되는 유리 조성물 |
| US8927054B2 (en) * | 2009-11-24 | 2015-01-06 | National Institute Of Advanced Industrial Science And Technology | Conductive substrate and process for producing same |
| JP5569094B2 (ja) * | 2010-03-28 | 2014-08-13 | セントラル硝子株式会社 | 低融点ガラス組成物及びそれを用いた導電性ペースト材料 |
| KR101309809B1 (ko) * | 2010-08-12 | 2013-09-23 | 제일모직주식회사 | 태양전지용 알루미늄 페이스트 및 이를 이용한 태양전지 |
| TWI432550B (zh) * | 2010-12-30 | 2014-04-01 | China Steel Corp | Lead - free conductive adhesive and its manufacturing method |
-
2015
- 2015-04-27 EP EP15720938.8A patent/EP3134903B1/de active Active
- 2015-04-27 WO PCT/EP2015/059087 patent/WO2015162298A1/de not_active Ceased
- 2015-04-27 DE DE102015207697.0A patent/DE102015207697A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015162298A1 (de) | 2015-10-29 |
| DE102015207697A1 (de) | 2015-10-29 |
| EP3134903B1 (de) | 2019-06-12 |
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